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We show that microwave-driven NV centers can function as topological modeswitches by utilizing a special degeneracy called an exceptional point (EP). Bytuning the intensities and frequencies of the driving fields, we find anEP---where two normal modes of the system coalesce---and, then, use it tosimulate the dynamics and demonstrate topological and non-reciprocal modeswitching. By comparing density matrices of the input and output states, wefind that the quantum correlations decrease by three orders of magnitude atroom temperature, and discuss ways for improving this result. This work extendsthe theory of topological mode switches (originally derived for pure states) tomixed states and is, therefore, applicable to general open quantum systems. Ourtheory enables exploring new phenomena (e.g., high-order EPs in low-dimensionalsystems) and presents a crucial step towards incorporating topological modeswitches in quantum-information applications.

Robust mode conversion in NV centers using exceptional points